The nuclear theory of the atom was put forward by:

What is the wavelength of light required to raise an electron in the $O^{7+}$ ion from $n=1$ shell to $n=2$ shell in $nm$?

$A$ certain metal has a work function of $\Phi = 2 \ eV$. It is irradiated first with $1 \ W$ of $400 \ nm$ light and later with $1 \ W$ of $800 \ nm$ light. Among the following,the correct statement is
[Given: Planck constant $(h) = 6.626 \times 10^{-34} \ J \ s$;
Speed of light $(c) = 3 \times 10^8 \ m \ s^{-1}$ ]

The frequency of the limiting line of the Lyman series in the hydrogen spectrum is ....

What is the difference in the line spectrum of different atoms compared to the hydrogen atom?

Which of the following represents the velocity of an electron in a hydrogen-like atom?